Alternatively, Cialis may be prescribed as an as-needed treatment for ED, to be taken before sexual activity. This medicine works best when you take it on an empty stomach an hour before sex. Pearlman says it can often take months to get an appointment with a healthcare provider who can prescribe the medications commonly used to treat ED. In addition, ED is extremely common. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow.AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping Available. AdSave on 50, Brand Name & Generic Drugs With SingleCare®. Get Your Free Rx Coupon Now! Find the Lowest Price for Your Prescription and Save at Your Local Pharmacy Today, pharmacies · Save Instantly · Save up-to 80% · BBB accreditedMore: About Us · Blog · FAQ · Find a Provider · Have questions? · How it Works · Join Now. Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg.